A store sells pens for $10 each. For every set of 3 pens purchased, a $5 discount is applied to the total.
If a customer buys 9 pens, what is the total amount they must pay?
A store sells pens for $10 each. For every set of 3 pens purchased, a $5 discount is applied to the total.
If a customer buys 9 pens, what is the total amount they must pay?
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